Automatic obturator for the supply pipe for burners



Oct. 18, 1927. 1,645,550

c. M. STEIN AUTOMATIC OBTURATOR FOR THE SUPPLY PIPE FOR BURNERS Filed Mayll. 1922 2 Sheets-Sheet 1 C. M. STEIN AUTOMATIC OBTURATOR FOR THE SUPPLY PIPE 'Fon BURNERS Oct. 18

Filed May ll. 1922 2 Sheets-Sheet 2 Patented Oct. '18, 1927.

PATENT OFFICE.

CHARLES M. STEIN, OF PARIS, FRANCE.

AUTOMATIC OIBTURATOR FOR-THE SUPPLY PIPE FOR BUBNEBS.

Application filed May 11, 1922, Serial No. 560,152, and in France May 14, 1921.

In his application for United States pat- .ent, Serial No. 560,151, filed May 11,1922,

the pipe which by increasing the velocity of the flow will momentarily stabilize the returning flame even if the volume be reduced and will thereby enable an obturator to be interposed for the purpose of definitively isolating the flame 110111 the reserve combustible. H

This invention has for its object a method of automatic obturation adapted for use with a safety device "of the sametype. As in the case or the application referred to above this 'obturator 15 released at the required moment by thefidestruction of a readily combustible connection through the efiect of the return of the flame. l

The accompanying drawings show by way of example two methods of construction of this obturator in which the rupture of the connection has the effect of cutting off the current passing through an electro-magnet and thereby causing an isolating valve to beclosed.

in these two forms of construction it is assumed that powdered combustible suspended in air is being distributed through a closed conduit.

The parts common to the two installations represented diagrammatically in Figures 1 and 2 are designated by the same reference letters.

in Figure 1,1 represents the distribution conduit and 2 isthe branch pipe for feeding the burner 3. It is this branch which must be completely closed in the event of the flame returning towards the main conduit.

For this purpose a conical valve 1 which is guided vertically may be caused to move on to its seat 5, the valve casing being placed in communication with the branch pipe 2 on the main conduit 1. The closing and the opening of the valve is effected by the fall and rise respectively of the armature of an electro-inagnet 6 connected with a branch circuit from the main cables 7 that serve all the furnaces. As long as current is passing through the electro-magnet, that is to say, in normal working, the armature of the electromagnet remains in its upper position and w maintains the counterweight 8 raised. In

this position, the valve 4 is held open by the lever 9,which is pivoted at the fixed point 10, and the link 11. If for any reason the current no longer passes through the solenoid the armature falls and the counterweight 8 presses the valve 4 firmly on its seat 5.

It will be obvious that if the current passing through the cables"? is taken from the circuit of the motor for the distribution fan 7 any voluntary or accidental stoppage of the said motor will cause the immediate closing or all the isolating valves.

But the most important function of the obturating device described above is the clos- 7:;

ing of the conduit in the event of the return orthe flame which constitutes a grave danger. At 12' there is inserted in the branch piping the before-mentioned special safety device comprising a constriction formed by so the junction of two divergent cones. -In the event of the return of the flame the acceleratron of the flow of the gases in the upper cone insures the stabilization of the said flame in the lower cone for some time. At the base as of the lower, cone a wire 13, which is attached to a fixed point by an instantaneously combustible connection 14, holds an automatic cut-out 15 in the closed position.

When the connection 14 is consumed the cut- 1 out 15 is released by the spring 16 and cuts oil the current in the electro-magnet 6, thereby ensuring the closing of the main conduit as hereinbefore described.

In addition there may be provided an or- 55 dinary hand switch 17 which, when operated by the workman, will enable anyone of the series of furnaces to be isolated at will.

In Figure 2 there is shown a modified method of operating the isolating valve 4 1 0 by breaking the circuit in an electro-magnet 18. The valve 4 is still guided verticall by its red and is suspended by the link 11 cm a lever 9 which is pivoted at a fixed point 10.

A spring19 takes the place of the counterweight 8 in the first construction and constantly tends to pull the valve 4 on to its seat 5. The end 9 of the lever 9 eng with the end 20* of the lever 20 that is pivoted at the fixed point 21 so' long as the our rent flows through the solenoid 18, that is to say, so long as the burner is allowed to remain in cocation with the source of powdered coal. But if for one of the-reasons already indicated,'viz, a b -.=n.- of the circuit; a voluntary interruption y the wormnan, or a return of the e; the cur rent is interrupted in the electroma et 18 so that it no longer pulls the end. or l I. lever lidv 20, the opposing spring 22 will cause the disengagement ot the levers 9 d20 the released spring 19 will eect the mag ot the brane I By pulling the small chains'which are rovided with handles 23and 24 and of vw ich one is attached to an arm on'the lever 20and the other to a .prolongation of the lever9 it, is possible to re-set the device after its operation. For this purpose .the ends of the the enga ement cannot be efiected by levers 9 and 20 are'provided at 9 and 20 with suitable rampswhich are ca able of sliding one on the other. On the ot or hand jerative position, and a non-electric conduct ing member situated who acted upon by the ,flame to cause a change in the electrical conditions of the instrument thereby to allow the closure to-elose the pipe.

2. A device for preventing the passage of flame through a pipe, comprising a closure for the pipe, an electrically actuated instrument normally holding the closure .in inop-' erative position, automatically moving means to changethe electrical conditions of the instrument to allowthe closure to close a the pipe, .a combustible member normally holding said means in a given osition and. situated to be actedupon 'by t e flame to causersuch. movement of said means as will cause t e actuation of the instrument to permitclosure of the pipe, and an element for actuating the device to cause the closure to" close the matic means. r d. 'llhe combination with a combustible pipe irrespective of said autoinstrument normally holdingJ pipe irrespective of said member.

Located material conveyin pipp shaped to retard the passage of flame therethrou'gh, of a plosure for the pipe, an electrically actuated inoperative position, a mem er situated to be acted upon by the retarded flameto cause a change inthe electrical'conditions of the instrument, thereby to permit the closure to 7close the pipe, and an element for actuating the device to cause the closure to'close the 4. A device for preventing the flare-back of flame through a-pipe comprising a closure for the pipe, an electrically actuated instrument normally holding the closure in inthe closure inoperative position and a member situated to 4 be acted upon bythe flame to cause a change in the electrical conditions ofthe instrument thereby to allow the-closure to close the pipe. p

5. A device for preventing-.the passage of flame through a pipe comprising a closure for the ipe, an electrically actuated instrument ho ding the closure in inoperative position, and a fusible member situated in the nth taken by the flame during the flare- I ack to be acted upon by the flame to cause a change in the electrical conditlons of the instrument thereby to allow the closure'to closethe pipe. 6 6. A device flame through a for the pipe e ment normalliy holdin operative position, an

the closure in ina member .sltuated in the. path taken by the flamediiring the 1 flare-back'and at a point between the closure and the point at which the flare-backbegins,

to be acted upon by the flame to cause a pipe comprising a' closure ectrically actuated lnstrufor preventing the passage of I change .in the electrical conditions of the l instrument thereby to allow the closure to close the pipe.

7. A device for preventing the passage of did flame througha pipe comprising a'closure v for the pipe, an electrically actuated instrument normally holding the closure in inoperative position and a combustible memher-situated within the pipe to burn vupon contact with the flame to cause a change in the electrical conditions of the instrument,

I thereby to allow the closure .to close the ipe.

- In testimony whereof l have signe my name to this specification.

,onaannsrt. ts'jrnm. 

